title: A case of perinephric liposarcoma which recurred ten years later from the initial operation.
abstract: A 58-year old man was referred to our hospital for treatment of an abdominal mass. As for him, tumor resection with right nephrectomy had been performed ten years ago for a giant well-differentiated perinephric liposarcoma. CT examination showed a huge tumor shadow in the abdominal cavity. Abdominal MRI examination showed a 15 × 8 cm tumor with almost high signal intensity on the T2 weighted images. At laparotomy, a large bulky retroperitoneal tumor pointed out before an operation was found. Surgical extirpation of the tumor was performed. Besides, several tumors of the thumb head size were detected into right retroperitoneal fatty tissue. The right side mesocolon and the tumors were not able to exfoliate, therefore right hemicolectomy was performed. Histological features showed dedifferentiated liposarcoma. The postoperative course was uneventful. But eight months after surgery, he was admitted again for treatment of a 4 × 3 cm retroperitoneal tumor. Extirpation of the tumor was performed. Histological finding of this tumor also showed dedifferentiated liposarcoma. Dedifferentiation, occurring in 15% of the well-differentiated liposarcomas, sometimes may develop later. Long-term detailed follow-up is necessary for well-differentiated liposarcoma.
authors.affiliation: Department of Surgery, Tokushima Prefectural Central Hospital, Tokushima, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Kuratate
authors.forename: Motoya
authors.initials: M
authors.lastname: Chikakiyo
authors.forename: Yuji
authors.initials: Y
authors.lastname: Kaneda
authors.forename: Yukari
authors.initials: Y
authors.lastname: Harino
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Hirose
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Yagi
authors.forename: Seiya
authors.initials: S
authors.lastname: Saitoh
authors.forename: Masayuki
authors.initials: M
authors.lastname: Sumitomo
authors.forename: Ryozo
authors.initials: R
authors.lastname: Fujino
authors.forename: Nobuo
authors.initials: N
authors.lastname: Satake
authors.forename: Takahiro
authors.initials: T
authors.lastname: Hirose
mesh_terms: D054337:Cell Dedifferentiation; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology* / Q000601:surgery; D008080:Liposarcoma / Q000473:pathology* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000473:pathology* / Q000601:surgery; D013997:Time Factors